Method of preventing polymerization of vinyl compounds and reaction of same with aldehydes



I aldehydes.

. Patented' June 24, 1 930 UNITED STATES PATENT our-"ICE KENNETH e.BLAIKIE, or SHAWINIGAN runs, QuEBnc, GAIN'ADA, AssIeNon 'rocANAmANELno'rnIc rnonucrs ooNrA Y, LIMITED, or MONTREAL, cANnDA mn'rnonor PREVENTING POLYMERIZATION or VINYL ooMr oUNns AND REACTION c 7 orsAMEwnrH ALnEnYnEs No Drawing.

This invention relates broadly to the manufacture and storage of certainsynthetic materials made by the; polymerization of vinyl compound'sandto products made by the treatment of vinyl compounds with aldehydes, andmore particularly refers to a method for preventing polymerization ofvinylcompounds and: preventing their reldehydes during the period ofpletely inhibited both polymerization and reaction with aldehydes.

In the manufacture of vinyl compounds,

esters, the material has a particularly Vinyl to polymerizeduringdismarked tendency 1 Q tillation' and, as a 7 result, low yieldsare obtained. Also, during the period of storage, such materials tendto'polymerize. It has been found that .if small amounts of sulphur areadded to the still during dismy hand,-

Application filed August 15, 1927. Serial No. 213,216. c

same with aldehydes from the sulphur by distillation. Y i

Having thus described my invention, what I claim is z- 1. The methodof'preventing polymerization ofvinyl compounds, which comprises addingsulphur to the vinyl compounds.

2. The method of preventing polymerization of vinyl compounds inmixtures con;

'taining a vinyl compound, which comprises adding sulphur to t emixtures.

3. The method o fpreventing reaction of a'vinyl compound with analdehyde, which comprises adding sulphur to a mixture of a vinylcompound and an aldehyde.

4. The method of preventin reaction of avinyl compound with an aldellydein mixtures including a vinyl to the mixtures.

In .witness whereof, I have hereunto set 'K NNErr I iBLAIKIE.

tillation, or added to the vessel during storage, it completely preventsthe vinyl ester from polymerizing and from reacting with Amountssuitable for this purpose are one-tenth of 1%, although this Even tracesof it are often sufiici'ent. In fact, in working with vinyl compounds inthe laboratory sufiicient sulphur may be taken up fromrubber connectionsto compolymerlzation or reaction pletely inhibit with aldehydes whetherthis olymerization orreaction would be otherwise effected bythe agencyof'heat, heat and pressure, or by radiation with active ra s.

Vinyl compounds or mixtures of .these compounds with treated withsulphur toprevent polymerization or reaction may be freed from sulphurby distillation.

, The invention, therefore, consists in treating vinyl compounds ormixtures thereof -with aldehydes, with sulphur .to preventpolymerization or reaction, as the case may be, during. distillation orstorage, and in freeing the compounds or mixtures of the aldehydes whichhave been 30 amount may. 'vary either above or below.

7 compound and an aldehyde, which comprisesadding sulphur

